Configuration tested on: phplist, version 2.10.14 Attention: make a backup copy before making any changes on your phplist server
Check PHPMailer version, PHPMailer added TLS/SSL SMTP support (required by RealSender), starting with: Version 2.0.0 rc1 (Thu, Nov 08 2007) If your system is running an ealier version: 1. Download the latest version of PHPMailer 2. Overwrite the existing files in lists/admin/phpmailer/
Add the following lines to the file lists/config/config.php after $phpmailer_smtppassword: $phpmailer_smtpsecure = 'tls'; $phpmailer_smtpport = 25; //25 or 587